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package org.herac.tuxguitar.gui.system.keybindings.xml;

 

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

 

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

 

import org.herac.tuxguitar.gui.system.keybindings.KeyBindingAction;

import org.herac.tuxguitar.gui.system.keybindings.KeyBinding;

import org.w3c.dom.Document;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

 

public class KeyBindingReader {

        private static final String SHORTCUT_TAG = "shortcut";

        private static final String ACTION_ATTRIBUTE = "action";

        private static final String KEYS_ATTRIBUTE = "keys";

        

        public static List getKeyBindings(String fileName) {

                try{

                        File file = new File(fileName);

                        if (file.exists()){

                                return getBindings(getDocument(file).getFirstChild());

                        }

                }catch(Throwable throwable){

                        throwable.printStackTrace();

                }

                return null;

        }

        

        private static Document getDocument(File file) {

                Document document = null;

                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

                try {

                        DocumentBuilder builder = factory.newDocumentBuilder();

                        document = builder.parse(file);

                } catch (SAXException sxe) {

                        sxe.printStackTrace();

                } catch (ParserConfigurationException pce) {

                        pce.printStackTrace();

                } catch (IOException ioe) {

                        ioe.printStackTrace();

                }

                return document;

        }

        

        /**

         * Read shortcuts from xml file

         * 

         * @param shortcutsNode

         * @return

         */

        private static List getBindings(Node shortcutsNode){

                List list = new ArrayList();

                

                NodeList nodeList = shortcutsNode.getChildNodes();

                for (int i = 0; i < nodeList.getLength(); i++) {

                        Node child = nodeList.item(i);

                        String nodeName = child.getNodeName();

                        

                        if (nodeName.equals(SHORTCUT_TAG)) {

                                NamedNodeMap params = child.getAttributes();

                                

                                String key = params.getNamedItem(KEYS_ATTRIBUTE).getNodeValue();

                                String action = params.getNamedItem(ACTION_ATTRIBUTE).getNodeValue();

                                

                                if (key == null || action == null || key.trim().equals("") || action.trim().equals("")){

                                        throw new RuntimeException("Invalid KeyBinding file format.");

                                }

                                

                                list.add(new KeyBindingAction(action, KeyBinding.parse(key)));

                        }

                }

                return list;

        }

}